How can I create a pull request in stash on issue transition in Jira?

In one of our team's workflows, they would like to have a pull request created for their issue branch in stash whenever they transition an issue from In Progress to Resolved. I've looked through the existing plugins and product capabilities and it looks like the current support for workflow triggers are all the other direction – you can tell JIRA to change the issue status on actions in Stash, but not the other way around.

Short of writing our own plugin to do this, is there something now that is workable either with an existing plugin or similar?